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**Hint:**In this type of question first, we know about the perimeter of a triangle.

Perimeter of triangle =2(l+b)

Where l is the length of the rectangle

B is the breadth of the triangle

Here, the breadth is given and length is 3 × Breadth – 4

Now, we can proceed to the solution.

**Complete step by step solution:**First, we know about the breadth of a rectangular hall.

As we know, the rectangle has 4 vertices and 4 edges and the internal angle is 90°.

In Euclidean plane geometry, a rectangle is a quadrilateral with four right angles.

The area of the rectangle is length × width and perimeter of the rectangle is 2 × (length + width)

It can also be defined as an equiangular quadrilateral, since equiangular means that all of its angles are equal.

According to the question,

Given that,

The breadth of the hall = b m

Now,

we find the length of the rectangular hall according to given condition, then,

length of the hall = 3 × (Breadth of hall) – 4

= 3 × b – 4

= 3b – 4

∴ length of hall = (3b – 4) meters.

**Note:**For solving this type of question, first, we know about the perimeter of triangle and area of a triangle that is The area of a rectangle is length × width and perimeter of a rectangle is 2 × (length + width)

It can also be defined as an equiangular quadrilateral, since equiangular means that all of its angles are equal.

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